Table 2.

Experimental matrix for the factorial design and center points

Run	Coded values		Reducing sugar (mg/mL)
	x 1	x 2	Experimental
1	-1	1	5.132
2	1	-1	5.716
3	-1	-1	4.897
4	-2	0	2.902
5	0	2	5.309
6	0	-2	5.088
7	0	0	5.807
8	0	0	5.667
9	2	0	5.444
10	1	1	5.601
11	0	0	5.717